Hi,
my current strings setup is: Isospeed 17 Classic at 52 pounds.
I play with a semi western forehand (moderate spin) and one hand backhand (eastern grip), mainly doubles.
With the current setup I am lacking in the control department and I would like a bit more of spin from the string bed. I can't play with poly/co-poly string. Could you please recommend strings (synthetic gut or multi) that they play well with this racket?
Thank you.

I used to have this racket.
It was hybrid-strung with Isospeed Axon Multi in the mains
and Tecnifibre X-One Biphase as the cross string.

I would recommend trying Ashaway MonoGut ZX Pro, which is a Zyex
string, a synthetic material which is the closest you can get to
natural gut. It has spin potential similar to polyester, and by using
a higher than average tension, you can get good control too.